I would like to install hand guards. Other than openning up the ends of the hand grips, is there any other 'surgery' that has to be done to the TW200, specifically the throttle side of the handle bar, in order to complete the installation? Also advise as to brand and size of guard would be helpful.

Hand guards have been explained numerous times on this forum. Search around and you'll find some good information. There are many good brands out there and most will fit. Installing them is pretty easy. I found this link that did a good job of explaining the installation process. I bought the same ones that are on my link. Find some that look cool to you. If you have any questions about compatibility, post it on this forum and I'm sure someone has the same ones and will be able to help you.

I have been very happy with my Tusk hand guards. I bought these in black.

Me and all my friends use tusk (same as above), we ride some rocky/hellish trails and the total number of bike drops is ALOT. The protection they provide will more than pay for them.Plus they have held up flawlessly